Revert "Remove led_null.c"

This reverts commit bef72a19d06f87f1e53da87d400c1d7948f344a3.

Makefile.common

@@ -207,6 +207,7 @@ OBJ += \
        input/common/input_hid_common.o \
        input/input_mapper.o \
        led/led_driver.o \
+       led/drivers/led_null.o \
        gfx/video_coord_array.o \
        gfx/video_display_server.o \
        gfx/video_crt_switch.o \

griffin/griffin.c

@@ -797,6 +797,8 @@ LEDS
 
 #include "../led/led_driver.c"
 
+#include "../led/drivers/led_null.c"
+
 #if defined(HAVE_RPILED)
 #include "../led/drivers/led_rpi.c"
 #endif

led/drivers/led_null.c

@@ -0,0 +1,27 @@
+/*  RetroArch - A frontend for libretro.
+ *
+ *  RetroArch is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *  PURPOSE.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with RetroArch.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../led_driver.h"
+#include "../../verbosity.h"
+
+static void null_led_init(void) { }
+static void null_led_free(void) { }
+static void null_led_set(int led, int state) { }
+
+const led_driver_t null_led_driver = {
+   null_led_init,
+   null_led_free,
+   null_led_set,
+   "null"
+};

led/led_driver.c

@@ -21,13 +21,6 @@
 
 static const led_driver_t *current_led_driver = NULL;
 
-static const led_driver_t null_led_driver = {
-   NULL, /* init */
-   NULL, /* free */
-   NULL,  /* set  */
-   "null"
-};
-
 bool led_driver_init(void)
 {
    settings_t *settings = config_get_ptr();

led/led_driver.h

@@ -41,6 +41,7 @@ void led_driver_free(void);
 
 void led_driver_set_led(int led, int value);
 
+extern const led_driver_t null_led_driver;
 extern const led_driver_t overlay_led_driver;
 extern const led_driver_t rpi_led_driver;